On the equation 1k + 2k + ⋯ + xk = yn for fixed x
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We provide all solutions of the title equation in positive integers x,k,y,n with 1≤x<25 and 11d" title="Click to view the MathML source">n≥3. For these values of the parameters, our result gives an affirmative answer to a related, classical conjecture of Schäffer. In our proofs we combine several tools: Baker's method (in particular, sharp bounds for the linear combinations of logarithms of two algebraic numbers), polynomial-exponential congruences and computational methods.

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